@book{606,
	author = {Kachalov, Alexander. and Kurylev, Yaroslav.},
	title = {Inverse boundary spectral problems /},
	publisher = {Chapman & Hall/CRC,},
	year = {c2001.},
	address = {Boca Raton, Fla. :},
	url = {http://www.loc.gov/catdir/enhancements/fy0646/2001032511-d.html}
}